Ya, had tried rebooting the system and stuff but the problem persisted. Tried rechecking my postfix/main.cf and everything looked ok. But i eventually bumped into somethng that i would like to fool myself into believing it sorted out thngs... got these commands from one websie...
# sudo chmod -R 755 /var/spool/postfix
# sudo chmod 1733 /var/spool/postfix/maildrop
so i did made a backup of the postfix folder and ran the two commands and ya, it worked. mail started moving again. Realised i had deleted one file...
i dont know of how much importance is that file, coz i didnt back it up.